PROBABILITY ANALYSIS OF REINFORCED CONCRETE STRUCTURE CONSIDERING NONLINEAR BEHAVIOUR AND DEGRADATION EFFECTS

This paper describes the reliability analysis of re inforced concrete structure of the containment and emergency tank under high internal overpressure. There is showed summary of calculation models and calculation methods for the probability analysis of the structural integrity in the case of the loss of coolant accident (LOCA). The uncertainties of the loads level (long-time tempera ture and dead loads), the material properties (concrete cracking and crushing, reinfor cement, and liner), degradation effects and other influences following the inaccuracy of th e calculated model and numerical methods were taking in the account in the 10 6 direct MONTE CARLO simulations. The task of probabilistic analysis of the concrete structure failure using nonlinear capacity of the concrete structures under extreme o verpressure was defined in the framework of safety check of the NPP structures in the case of accident. The concrete structures of hermetic zone were analyzed for number of situations, such as a LOCA (Loss of Coolant Accident) or a HELB (High Energy Line Break) or a SBLA (Steam Line Break Accident) on the different primary loop piping system.